Mitsubishi Electric Mr. Slim MXZ-3A30NA User manual

MITSUBISHI
WA ELECTRIC
Split-type Air-Conditioner
MXZ-3A30NA
MXZ-4A36NA
INSTALLATION MANUAL
* Refer to the installation manual of each indoor unit for indoor unit in-
stallation.
This manual mentions how to install only the outdoor unit (MXZ-3A30NA, MXZ-
4A36NA). As for the way of installation for indoor unit, please refer to the installa-
tion manual being attached each indoor unit.
The installation manual details the suggested installation method.
Any structural alterations necessary for installation must comply with local build-
ing code requirements.
1. BEFORE INSTALLATION ooo ee ete rere renee enter aae sens eetaeeneaees 2
2. OUTDOOR UNIT INSTALLATION o.oo teeter eter etter e tae eeennees 5
3. FLARING WORK AND PIPE CONNECTION... eee ee eter rete 7
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN... 8
FOR INSTALLER

1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY’ before installing the air conditioner.
Be sure to observe the warmings and cautions specified here as they include important items related to safety.
After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
INT Ut
Hf Do not install the unit by yourself (user).
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water. Consult the dealer from whom you pur-
chased the unit or a qualified installer.
Hf Perform the installation securely referring to the installation manual.
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water.
Hi Install the unit securely in a place which can bear the weight of the
unit.
lf the installation location cannot bear the weight of the unit, the unit
could fall causing injury.
Hf Perform electrical work according to the installation manual and be
sure to use an exclusive circuit. Do not connect other electrical appli-
ances to the circuit.
lf the capacity of the power circuit is insufficient or there is incomplete
electrical work, it could result in a fire or an electric shock.
Hi Do not damage the wires by applying excessive pressure with parts
or screws.
Damaged wires could cause fire.
Hf Be sure to cut off the main power in case of setting up the indoor P.C.
board or wiring works.
Failure to do so could cause electric shock.
lf Use the specified wires to connect the indoor and outdoor units se-
curely and attach the wires firmly to the terminal block connecting
sections so the stress of the wires is not applied to the sections.
Incomplete connecting and securing could cause fire.
Hf Do not install the unit in a place where inflammable gas may leak.
If gas leaks and accumulates in the area around the unit, it could cause
an explosion.
Hf Do not use intermediate connection of the power cord or the exten-
sion cord and do not connect many devices to one AC outlet.
It could cause a fire or an electric shock due to defective contact, defec-
tive insulation, exceeding the permissible current, etc.
lf Be sure to use the parts provided or specified parts for the installa-
tion work.
The use of defective parts could cause an injury or leakage of water due
to a fire, an electric shock, the unit falling, etc.
Hf When plugging the power supply plug into the outlet, make sure
that there is no dust, clogging, or loose parts in both the outlet and
the plug. Make sure that the power supply plug is pushed complete-
ly into the outlet.
lf there is dust, clogging, or loose parts on the power supply plug or the
outlet, it could cause electric shock or fire. If loose parts are found on the
power supply plug, replace it.
(Could lead to death, serious injury, etc.)
yee aie
Hi Install an ground leakage breaker depending on the installation
place.
If an ground leakage breaker is not installed, it could cause electric
shock.
Hf Perform the drainage/piping work securely according to the installa-
tion manual.
lf there is defect in the drainage/piping work, water could drop from the
unit, soaking and damaging household goods.
(Could iead to serious injury in particular environments when operated incorrectly.)
Hf Attach the electrical cover to the indoor unit and the service panel
to the outdoor unit securely.
lf the electrical cover of the indoor unit and/or the service panel of the
outdoor unit are not attached securely, it could result in a fire or an
electric shock due to dust, water, etc.
Hi When installing or relocating the unit, make sure that no sub-
stance other than the specified refrigerant (R410A) enters the
refrigerant circuit.
Any presence of foreign substance such as air can cause abnormal
pressure rise or an explosion.
Hf Do not discharge the refrigerant into the atmosphere. If refrigerant
leaks during installation, ventilate the room.
If refrigerant comes in contact with a fire, harmful gas could be gener-
ated.
i Check that the refrigerant gas does not leak after installation has
been completed.
If refrigerant gas leaks indoors, and comes into contact with the flame
of a fan heater, space heater, stove, etc., harmful substances will be
generated.
Hi Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times more than R22. Not using appropri-
ate tools or materials and incomplete installation could cause the pipes
to burst or injury.
Hf When pumping down the refrigerant, stop the compressor before
disconnecting the refrigerant pipes.
lf the refrigerant pipes are disconnected while the compressor is run-
ning and the stop valve is open, air could be drawn in and the pressure
in the refrigeration cycle could become abnormally high. This could
cause the pipes to burst or injury.
Hi When installing the unit, securely connect the refrigerant pipes
before starting the compressor.
lf the compressor is started before the refrigerant pipes are connected
and when the stop valve is open, air could be drawn in and the pres-
sure in the refrigeration cycle could become abnormally high. This
could cause the pipes to burst or injury.
Hf Fasten a flare nut with a torque wrench as specified in this
manual.
If fastened too tight, a flare nut may break after a long period and cause
refrigerant leakage.
Hf The unit shall be installed in accordance with national wiring regu-
lations.
Hi Ground the unit correctly.
Do not connect the ground to a gas pipe, water pipe, lightning rod or
telephone ground. Defective grounding could cause electric shock.
Do not touch the air inlet or the aluminum fins of the outdoor
unit.
This could cause injury.
Hf Do not install the outdoor unit where small animals may live.
If small animals enter and touch the electric parts inside the unit, it
could cause a malfunction, smoke emission, or fire. Also, advise user
to keep the area around the unit clean.
1-2. REQUIRED TOOLS FOR INSTALLATION
Phillips screwdriver
Level
Scale
Utility knife or scissors
Torque wrench
Wrench (or spanner)
Flare tool for R410A
1-3. SPECIFICATIONS
4 mm (5/82 in.) hexagonal wrench
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
Power supply Pipe length and height difference *2, *3, *4, *8
Model Rated Freauenc Max. pipe length per indoor Max. Max. no. of bends per in- | Refrigerant adjustment A
Voltage q ¥ unit / for multi-system height difference door unit / for multi system *5
MXZ-3A30NA 208/
MXZ-4A36NA | 230 V 60 Hz 25 m (82 ft) / 70 m (230 ft) 15 m (49 ft) 25/70 20 g/m (1.06 oz each 5 ft)
*1 Never use pipes with thickness less than specified. The pressure resist-
ance will be insufficient.
*2 Use a copper pipe or a copper-alloy seamless pipe.
*3 Be careful not to crush or bend the pipe during pipe bending.
*4 Refrigerant pipe bending radius must be 100 mm (4 in.) or more.
*5 If pipe length exceeds 40 m (131 ft), additional refrigerant (R410A) charge
is required. (No additional charge is required for pipe length less than
40 m (131 ff.)
Additional refrigerant (m)} = A x (pipe length (rm) - 40)
Additional refrigerant (it) = A x Bipe ten n ft) - 131
*6 Insulation material : Heat resisting foam plastic 0.045 specific gravity
*7 Be sure to use the insulation of specified thickness. Excessive thickness
may cause incorrect installation of the indoor unit and insufficient thick-
ness may cause dew drippage.
*8 If the outdoor unit is installed higher than the indoor unit, max. height
difference is reduced to 10 m (33 ft).

1-4. SELECTING PIPE SIZE AND OPTIONAL DIFFERENT-DIAMETER JOINTS
The diameter of connection pipes differs according to the type and capacity of indoor units. Match the diameters of connection pipes for indoor and outdoor
units according to the following table.
« Ifthe diameter of connection pipes does not match the diameter of pipe end connections, use optional different-diameter joints.
[mm (inch)]
Indoor unit
Outdoor unit = : 09/12 15/17 24
ipe size
(liquid / gas) 6.35 (1/4) / 9.52 (3/8) 6.35 (1/4) / 12.7 (1/2) 6.35 (1/4) / 15.88 (5/8)
AUNIT 6.35 (1/4) / 12.7 (1/2) ~ /MAC-A455JP -f- -/ MAC-A456JP
B UNIT
C UNIT 6.35 (1/4) / 9.52 (3/8) ~/- ~/ MAC-454JP -/ PAC-SG76RJ
D UNIT *
* MXZ-4A36NA only
1-5. SELECTING THE INSTALLATION LOCATION
+ Where it is not exposed to strong wind.
+ Where airflow is good and dustless.
+ Where rain or direct sunshine can be avoided as much as possible.
+ Where neighbours are not annoyed by operation sound or hot air.
+ Where rigid wall or support is available to prevent the increase of op-
eration sound or vibration.
+ Where there is no risk of combustible gas leakage.
+ When installing the unit at a high level, be sure to secure the unit legs.
+ Where it is at least 3 m (9.84 ft) away from the antenna of TV set or
radio. Operation of the air conditioner may interfere with radio or TV re-
ception in areas where reception is weak. An amplifier may be required
for the affected device.
+ Install the unit horizontally.
+ Please install it in an area not affected by snowfall or blowing snow.
In areas with heavy snow, please install a canopy, a pedestal and/or
some baffle boards.
Note:
Itis advisable to make a piping loop near outdoor unit so as to reduce
vibration transmitted from there.
Note:
When operating the air conditioner in low outside temperature, be sure
to follow the instructions described below.
+ Never install the outdoor unit in a place where its air inlet/outlet side
may be exposed directly to wind.
+ To prevent exposure to wind, install the outdoor unit with its air inlet
side facing the wall.
+ To prevent exposure to wind, it is recommended to install a baffle
board on the air outlet side of the outdoor unit.
Avoid the following places for installation where air conditioner trouble
is liable to occur.
+ Where flammable gas could leak.
+ Where there is much machine oil.
+ Salty places such as the seaside.
+ Where sulfide gas is generated such as a hot spring.
+ Where there is high-frequency or wireless equipment.
FREE SPACE REQUIRED AROUND OUTDOOR UNIT
1. Top side obstacles 2. Front (blowing) side open
When there is an obstacle behind the 100 (3.94) or more As long as space like the one
rear side only, it does not matter if shown in the figure can be
there is an obstacle over the top side maintained, it does not mat- 200 (7.87)
as shown in the figure below. 500 (19.68) | | ter if there are obstacles in YZ SEMONe
ormore three directions (but top side _
4 is open). C___)
100 (3.94) 350 (13.78)
WY or more or more
TH T t
3. Obstacles on front (blowing) side only —————————_ 4, Obstacles on front and rear side only
In this case, the rear, both sides and The unit can be used by at-
top should be open. taching an optional outdoor LLLLLLLLLE NEEL + 100 (3.94)
blowing guide (MAC-855SG) or more
(but both sides and top are
‘ge | 500 (19.68) or more open). 500 (19.68) or more
7,
Blowing guide (MAC-855SG)
5. Service space
Keep the service space as shown in the figure below for mainte- .
nance.
When installing the unit in an area that is enclosed on four sides such
as a verandah, be sure to leave move than 200 mm (7.87 in.) behind
the unit as shown.
+ When there is a lack of airflow or there is a possibility of becoming
100 (3.94) short cycle, install an outlet guide and make sure there is enough
or more space behind the rear side of the air inlet.
Service space
Note:
—- Make sure not to install several outdoor units sideways next to each
500 (19.68) or more other.
100
(3.94)
|
Window
or more
ULL (LLL
if More than 200
500 (19.68) 350 (13.78) or more More than - (787) ¢ More than
or more 100 (3.94) More than 4y 350 (13.78)
VA 200 (7.87) — f
More than
200 (7.87)
Less than 1,200 (47.3) of the front surface side
[Unit: mm (inch)]

1-6. INSTALLATION DIAGRAM
PARTS TO BE PROVIDED AT YOUR SITE
A) |Power supply cord”
B) |Indoor/outdoor unit connecting wire*
After the leak test, apply insulat-
ing material tightly so that there is
no gap.
When the piping is to be at-
{tin plated) or metal netting, use
a chemically treated wooden
piece 20 mm (7.9 in.) or thicker
between the wail and the piping
or wrap 7 to 8 turns of insulation
vinyl tape around the piping.
To use existing piping. perform
COOL operation for 30 minutes
and pump down before removing
the old air conditioner. Remake
flare according to the dimension
for new refrigerant.
Open as a rule “4
More than 500 mm &)
(19.69 in.) if the front
and both sides are open
MXZ-3A30NA _
More than
100 mm (3.94 in.)
More than
200 mm (7.87 in.) if there are
More th _, obstacles to both sides
lore than
100 mm
(3.94 in.)
Open as a rule
More than 500 mm (19.69 in.) if the back, More than 350 mm (13.78 in.)
both sides and top are open
D) |Wall hole cover
mde
[ade
[smd
|
anc
[nad
(
(
(C)|Extension pipe (Refer to 1-4.)
(
(
E) |Piping tape
tached to a wall containing metals
Extension drain hose
(or soft PVC hose, 15 mm (19/32
in.) inner diameter or hard PVC
pipe VP16)
Little
(G) | Refrigeration oil amount
(H) |Putty 1
(1) |Pipe fixing band 2to7
(J) | Fixing screw for (1) 2to7
(K) |Wall hole sleeve 1
Soft PVC hose, 25 mm (31/32 in.)
(L) Jinner diameter or hard PVC pipe 4
VP25 for drain socket
Units should be installed by licensed contractor according to local code requirements.
Outdoor unit installation
200 2-U-shape notched holes
(7.87)
500
(19.69)
/3
(Base
bolt
M10)
way NO
| G Airin a |
yy
( }
I} |
I TEE:
; T
&
nirout
“Nt
2-12
(0.47)
x
36
(1.42)
Oval
holes
900
(35.43)
(Base
bolt
M10)
90°1
4)
Airing
320
(12.6)
(gee)
se
(peGt)
28€
(4g
[Unit: mm (inch)
1-7. MOUNTING ARRANGEMENT OF DRAIN SOCKET
Please perform the drain piping work only when draining from one place.
1 Choose one hole to discharge drain and install the drain socket to the hole.
2 Close the rest of the holes with the drain caps.
* Note:
Place indoor/outdoor unit connecting wire (B) and
power supply cord (A) al least 1 m (39.4 in.) away
from the TV antenna wire.
The “Q'ty” for (B) to (K) in the above table is quan-
tity to be used per indoor unit.
3 Connect a vinyl hose of 25 mm (31/32 in.) in the inside diameter on the market with the drain socket and lead drain.
Note:
Do not use the drain socket and the drain cap in the cold region.
Drain may freeze and it makes the fan stop.

2-1. INSTALLING THE UNIT
+ Be sure to fix the unit’s legs with bolts when installing it.
+ Be sure to install the unit firmly to ensure that it does not fall by an earthquake or a gust.
+ Refer to the figure in the right for concrete foundation.
+ Do not use the drain socket and the drain cap in the cold region.
Drain may freeze and it makes the fan stop.
Anchor leg
Fix here with
EX
M10
bolts.
25
(1) or
fess
Anchor both jength
Z
Make with wider.
Make the setting { “i,
depth deeper, 14“44 7
2-2. CONNECTING WIRES FOR OUTDOOR UNIT
+ Be sure to use special circuits for room air conditioner.
+ Wiring work should be based on applicable technical standards.
+ Wiring connections should be made following the diagram.
+ Screws should be tightened so they won't loosen.
ELECTRICAL SPECIFICATIONS
OUTDOOR UNIT MXZ-3A30NA
/ PHASE, Hz
Max. Fuse size 20
Min. Circuit 15
Fan motor 0.93
11
15
indoor unit-Remote controller : (Wireless)
Indoor unit-Outdoor unit : DC12-24V
Power 208/230, 1, 60
Compressor
Control voltage
41) Remove the service panel.
2) Fix the conduit connector to conduit cover with lock nut then secure it
against unit with screws.
3) Fix the conduit cover to the outdoor unit then secure it with screws.
4) Connect power supply cord and indoor/outdoor connecting wire to the ter-
minal block.
(Leave some slack in wires to allow easier servicing.)
5) Close the service panel securely. Make sure that 3-2. PIPE CONNECTION
is completed.
Connecting order Power supply
« Connect the terminal block in order,
500
(19.69)
———
28
203
Anchor both pitch
[Unit: mm (inch)]
MXZ-4A36NA
20
19
4A36NA
Service panel
é
from the A, B and C unit side.
Terminal block for
indoor/outdoor unit

Remark:
* A disconnect switch should be required. Check the local code.
Use a ring tongue terminal in order to connect a ground wire to terminal.
*“* MXZ-4A36NA only
INDOOR UNITIA]
Terminal block
INDOOR UNITE]
Terminal block
INDOOR UNITE]
Terminal block
a A
INDOOR UNITD]
Terminal block
An S
Grounding Grounding 7 + | Grounding Grounding
t terminal ** te terminal ** i A A Ne terminal ** terminal **
208/230 V AC Disconnect 208/230 V AC Disconnect 208/230 V AC Disconnect 208/230 V AC Disconnect
41phase 60 Hz switch * 41phase 60 Hz switch * iphase 60 Hz: switch * iphase 60 Hz switch *
Grounding Grounding Grounding Grounding
terminal ** terminal ** terminal ** terminal **
rs 4 4
oO
Sisas3
Terminal block
UNIT C
oO
S1s2s3
Terminal block
UNIT B
OUTDOOR UNIT
oO
sisaisg
Terminal block
UNIT A
t
| Terminal
| block 4
1 L
UNIT D ***
¥
Oo
Sisas3 d
Terminal block
L
Ground
Power supply 208/230 V AC | Connect wires to the matching numbers of terminals.
iphase 2wires 60 Hz
CONNECTING WIRES AND CONNECTING GROUND WIRE
+ Use solid conductor AWG14 or stranded conductor AWG14.
+ Use double insulated copper wire with 600 V insulation.
+ Use copper conductors only.
Follow local electrical code.
POWER SUPPLY CABLE AND GROUND WIRE
+ Use solid or stranded conductor AWG14.
+ Use copper conductors only.
* Follow local electrical code.
ZX WARNING:
Use the indoor/outdoor unit connecting wire that meets the Standards to connect the indoor and outdoor units and fix the wire to the terminal
block securely so that no external force is conveyed to the connecting section of the terminal block. An incomplete connection or fixing of the
wire could result in a fire.
For future servicing, give extra length to the connecting wires.

3-1. FLARING WORK
4) Cut the copper pipe correctly with pipe cutter. (Fig. 7, 2)
2) Completely remove ail burrs from the cut cross section of pipe. (Fig. 3) Good No good
+ Put the end of the copper pipe to downward direction as you Copper 90;- pn ee x
remove burrs in order to avoid to let burrs drop in the piping. (Ke pipe {
3) Remove flare nuts attached to indoor and outdoor units, then put them < fA A fA
on pipe having completed burr removal. (Not possible to put them on
after flaring work.) Tilted Uneven Burred
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension . .
shown in the table. Select A mm from the table according to the tool Fig. 4 Fig. 2
5) Check. Flaring tool
* Compare the flared work with Fig. 6. Burr Copper pipe ~
. . : 4 Spare reamer iS cE
+ If flare is noted to be defective, cut off the flared section and do :
" .
1)
>
72
Pipe
cutter
Es
\
flaring work again. | |
Clutch type Wing nut type
Fig. 3 Fig. 4
A Inside is shin-
Smooth all ing without any
around scratches.
QTY
; / —-—- Copper pipe Bid \
Die ~ Even length
Fi ‘ all around
are nut
Fig. 5 Fig. 6
Pipe
diameter
Nut
A
[mm
(inch)}
Tightening
torque
; Clutch type tool Clutch type tool Wing nut type tool
ch “| . .
[mm (inch)] (mm) for R410A for R22 for R22 Nem kgfecm ftlb
@6.35 (1/4) 17 1.5 to 2.0 13.7 to 17.7 | 140 to 180 10 to 13
@9.52 (3/8) 22 0100.5 1.0 to 1.5 (0.06 to 0.08) 34.3 to 41.2 | 350 to 420 | 25 to 30
@12.7 (1/2) 26 (0. to 0.02) (0.04 to 0.06) 201025 49.0 to 56.4 | 500 to 575 36 to 42
@15.88 (5/8) 29 (0.08 to 1.0) 73.5 to 78.4 | 750 to 800 54 to 58
3-2. PIPE CONNECTION
+ Fasten flare nut with a torque wrench as specified in the table.
+ When fastened too tight, flare nut may brake after a long period and
cause refrigerant leakage.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same
manner applied for indoor unit.
« For tightening, use a torque wrench or spanner and use the same
tightening torque applied for indoor unit.
3-3. INSULATION AND TAPING
4) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (E), apply taping starting from the entry of outdoor
unit.
* Stop the end of piping tape (E) with tape (with adhesive agent at-
tached).
+ When piping have to be arranged through above ceiling, closet or
where the temperature and humidity are high, wind additional com-
mercially sold insulation to prevent condensation.

4-1. PURGING PROCEDURES AND LEAK TEST
4) Remove service port cap of stop valve on the side of the outdoor unit
gas pipe. (The stop valve will not work in its initial state fresh out of the
factory, totally closed with cap on.)
2) Connect gauge manifold valve and vacuum pump to service port of
stop valve on the gas pipe side of the outdoor unit.
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4) Check the vacuum with gauge manifold valve, then close gauge mani-
fold valve, and stop the vacuum pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge mani-
fold valve remains in the same position. Confirm that pressure gauge
shows ~-0.101 MPa [Gauge] [~760 mmHg (~30 in. Hg).
6) Remove gauge manifold valve quickly from service port of stop valve.
7) After refrigerant pipes are connected and evacuated, fully open all
stop valves on both sides of gas pipe and liquid pipe. Operating with-
out fully opening lowers the performance and this causes trouble.
8) Refer to 1-4., and charge the prescribed amount of refrigerant if
needed. Be sure to charge slowly with liquid refrigerant. Otherwise,
composition of the refrigerant in the system may be changed and af-
fect performance of the air conditioner.
9) Tighten cap of service port to obtain the initial status.
10) Leak test
4-2. GAS CHARGE
Perform gas charge to unit.
4 Connect gas cylinder to the service port of stop valve.
2 Perform air purge of the pipe (or hose) coming from refrigerant gas
cylinder.
3 Replenish specified amount of the refrigerant, while operating the air
conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the
refrigerating cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure
to use liquid refrigerant. Adding gas refrigerant may change the composi-
tion of the refrigerant in the system and affect normal operation of the air
conditioner. Also, charge the system slowly, otherwise the compressor
will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder
with warm water [under 40°C (140°F)] during cold season. But never use
naked fire or steam.
“Open 22 ftelb)
Hexagonal! wrench
70. 101MPa Compound pressure
[-760 mmHg
4 to 5 turns Stop vaive cap (-30in. Hg)] gauge (for R410A)
(Torque 19.6 to 29.4 Nem,
Pressure gauge
*Close 200 to 300 kgfcm, 15 to
6 (for R410A)
Gauge manifold
valve (for R410A)
Stop valve
for GAS
/
Service port cap Pea
(Torque 13.7 to
17.7 Nem, 140 to
180 kgfcm, 10 to
13 ft*lb) Vacuum pump
top valve (for R410A)
for LIQUID
Precautions when using When attaching the control valve to
the service port. valve core may de-
the control valve
form or loosen if excess pressure is
applied. This may cause gas leak.
Control
val ven
Pe & Service port When attaching the control valve to
cna the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
Charge hose Part A or tum the body when vaive
Body (forR410A) core is in open position.
REA EN
Stop valve
Liquid pipe
Outdoor unit
(MXZ-4A36NA)
Stop valve with
service port
Gas pipe
Refrigerant gas
cylinder
operating valve
(for R410) \
~+— Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
LJ ~— Electronic scale for
refrigerant charging

4-3. TEST RUN
Be sure to perform the test run for each unit. Make sure each indoor
unit operates properly following the installation manual attached to the
unit.
+ If you perform the test run for all indoor units at once, you cannot de-
tect any erroneous connection, if any, of the refrigerant pipes and the
indoor/outdoor unit connecting wires.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the
compressor will not operate for 3 minutes to protect the air conditioner.
Wiring/piping correction function
This unit has a wiring/piping correction function which corrects wiring
and piping combination. When there is possibility of incorrect wiring and
piping combination, and confirming the combination is difficult, use this
function to detect and correct the combination by following the proce-
dures below.
Make sure that the following is done.
+ Power is supplied to the unit.
+ Stop valves are open.
Note:
During detection, the operation of the indoor unit is controlled by the out-
door unit. During detection, the indoor unit automatically stops operation.
This is not a malfunction.
Procedure
Press the piping/wiring correction switch (SW871) 71 minute or more after
turning on the power supply.
+ Correction completes in 10 to 15 minutes. When the correction is com-
pleted, its result is shown by LED indication. Details are described in
the following table.
+ To cancel this function during its operation, press the piping/wiring cor-
rection switch (SW871) again.
+ When the correction completed without error, do not press the piping/
wiring correction switch (SW871) again.
When the result was “cannot be corrected”, press the piping/wiring cor-
rection switch (SW871) again to cancel this function. Then, confirm the
wiring and piping combination in a conventional manner by operating the
indoor units one by one.
+ The operation is done while the power is supplied. Make sure not to
contact parts other than the switch, including the P.C. board. This may
cause electric shock or burn by hot parts and live parts around the
switch. Contacting the live parts may cause P.C. board damage.
+ To prevent electronic control P.C. board damage, make sure to per-
form static elimination before operating this function.
+ This function does not operate when the outside temperature is 0°C
(32°F) or below.
4-4. EXPLANATION TO THE USER
+ Using the OPERATING INSTRUCTIONS, explain to the user how to
use the air conditioner (how to use the remote controller, how to re-
move the air filters, how to remove or put the remote controller in the
remote controller holder, how to clean, precautions for operation, etc.)
+ Recommend the user to read the OPERATING INSTRUCTIONS care-
fully.
Lessoue
5
a
oo
roc
re
oO
0
LED indication during detection:
LED
4 (Red) 2 (Yellow) 3 (Green)
Lighted Lighted Blinking
Result of piping/wiring correction function
LED
1 (Red) | 2 (Yellow) 3 (Green) Result
Lighted |Not lighted Lighted |Completed (Corrected successfully)
Blinking Blinking Blinking |Cannot be corrected
Refer to “SAFETY PRECAUTIONS
Other indications WHEN LED FLASHES?” located
behind the service panel.

10

a. MITSUBISHI ELECTRIC CORPORATION
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO
100-8310, JAPAN
JG79A073H02